python - 如何制作不同的正交投影 Pyglet？

Question

我制作了两个立方体视口(viewport)，但它们都是正面正交投影，我需要其中一个来自侧面。这是绘图代码draw_small 正在绘制小型静态立方体dwar_big是大立方体的绘制，可以移动、缩放和旋转

    def on_draw(self) :

        self.clear()

        pgl.glClear(pgl.GL_COLOR_BUFFER_BIT | pgl.GL_DEPTH_BUFFER_BIT)

        pgl.glViewport(0, 0, 650, 500)
        pgl.glMatrixMode(pgl.GL_PROJECTION)
        pgl.glLoadIdentity()
        pgl.glOrtho(-1300 / 8, 1300 / 8, -1000 / 8, 1000 / 8, 100, 500)
        pgl.glMatrixMode(pgl.GL_MODELVIEW)
        pgl.glLoadIdentity
        pgl.glTranslatef(0, 0, -100)
        pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_FILL)
        draw_small()

        pgl.glPushMatrix()
        pgl.glTranslatef(self.x, self.y, self.z)
        pgl.glRotatef(self.xRotation, 1, 0, 0)
        pgl.glRotatef(self.yRotation, 0, 1, 0)
        pgl.glRotatef(self.zRotation, 0, 0, 1)
        pgl.glScalef(self.zoom, self.zoom, self.zoom)

        if not transparant:
            pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_FILL)
        else:
            ogl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_LINE)

        draw_big()

        pgl.glPopMatrix()


        pgl.glViewport(650, 0, 650, 500)
        pgl.glMatrixMode(pgl.GL_PROJECTION)
        pgl.glLoadIdentity()
        pgl.glOrtho(-1300 / 8, 1300 / 8, -1000 / 8, 1000 / 8, 0, 500)
        pgl.glMatrixMode(pgl.GL_MODELVIEW)
        pgl.glLoadIdentity()
        pgl.glTranslatef(0, 0, -100)
        pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_FILL)

        draw_small()

        pgl.glPushMatrix()
        pgl.glTranslatef(self.x, self.y, self.z)
        pgl.glRotatef(self.xRotation, 1, 0, 0)
        pgl.glRotatef(self.yRotation, 0, 1, 0)
        pgl.glRotatef(self.zRotation, 0, 0, 1)
        pgl.glScalef(self.zoom, self.zoom, self.zoom)

        if not transparant:
            pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_FILL)
        else:
            pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_LINE)

        draw_big()

        pgl.glPopMatrix()

Answer 1

只需将 View 绕 View 空间中的 y 轴旋转 90 度即可:

pgl.glMatrixMode(pgl.GL_MODELVIEW)
pgl.glLoadIdentity
pgl.glTranslatef(0, 0, -100) 
pgl.glRotatef(-90, 0, 1, 0) # roatet 90 degrees around view space y axis

注意，左 View 和右 View 是由 pgl.glRotatef(-90, 0, 1, 0) 生成的和pgl.glRotatef(90, 0, 1, 0) .
顶部和底部 View 是通过绕 View 空间 x 轴旋转来实现的，通过 pgl.glRotatef(90, 1, 0, 0)分别pgl.glRotatef(-90, 0, 1, 0) .